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i need one suggestion for shielding of a gamma source.

I have a gamma source with initial activity of 50 mCi=1.85X10^9Bq.

What thickness of lead needed to protect myself!

I used the formula I(x)=I exp(-kx). I=50mCi; k=37.6 cm^2/g (linear attenuation for 122 keV) and x the thickness needed (i took I(x)=1). By the above formula i get ~6mm. Is that okay..

if i am wrong pls. correct me!

2. Is there any good website to get k (linear attenuation) values???

thanks

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